Members cannot login, I can

[Sovereign]

I have a user who says he cannot login, period. There seems to be a problem with one of my usergroups (Bloggers) who cannot login, because when I had him in the Bloggers group when I tried to login as him I got a "No Permission" message immediately after the login (I didn't even have authorization, apparently, to view my own homepage, but the forums URL resolved okay). Any idea what causes that? Forum permissions are set correctly, I copied them off Registered Users.

I changed his group to Registered Users, and I was able to login without issue or permissions errors in his account, but he claims that when he tried to login, he entered his username and password, the page refreshed and he was staring at the same login box as if he hadn't done anything.

I've cross-posted this to vBAdvanced as I am running their CMPS, but I have a feeling the problem lies in a combination of settings across both pieces of software.

http://www.thetheoryofpolitics.com

Test User Account (Do not change!)
Name: TestUser (case sensitive!)
Pass: testuser1

[Zachery]

Is this a primary or secondary usergroup?

[Sovereign]

Bloggers is the primary usergroup for these people. I don't have any users set up with secondary usergroups.

[Steve Machol]

Try logging in as this user to see if you have the same problem. If you don't, then the cause is somewhere on their end. It's impossible to know exactly what it is but some possibilities are: browsers, browser settings, Internet and security settings, ISP and/or cache issues, firewalls, ad-blockers, spyware, proxies and any other application that affects Internet content.